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Hydrothermal synthesis of carbon quantum dots as fluorescent probes for sensitive and rapid detection of picric acid

Abstract

Heteroatom doping is an efficient approach to regulate the fluorescence properties of carbon nanodots. A novel water-soluble and high fluorescent nitrogen doped carbon dots were synthesized by effective hydrothermal method using mandelic acid and ethylenediamine as carbon and nitrogen sources without further chemical modification. The quantum yield of the obtained nitrogen doped carbon dots is higher up to 41.4%. Then, the surface morphology and optical properties of the synthesized nitrogen doped carbon dots were characterized. The results revealed that nitrogen doped carbon dots were spherical shaped with an average diameter of 2.5 nm and emitted bright blue fluorescence with an emission peak at about 429 nm (excited at 342 nm). Additionally, the higher quantum yield nitrogen doped carbon dots were employed to detect picric acid selectively and sensitively by fluorescence quenching phenomenon based on a possible fluorescence resonance energy transfer process. A good linear relationship in the range of 0.5-30 µmol/L was obtained with a detection limit of 0.041 μmol/L (S/N=3). Eventually, the nitrogen doped carbon dots were applied for detection of picric acid in actual water sample. The recoveries felt in the range of 94.92% -107.84% and the relative standard deviations were 1.64% -2.80%.

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Publication details

The article was received on 27 Feb 2018, accepted on 12 May 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8AY00441B
Citation: Anal. Methods, 2018, Accepted Manuscript
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    Hydrothermal synthesis of carbon quantum dots as fluorescent probes for sensitive and rapid detection of picric acid

    Y. wang, X. chang, N. jing and Y. Zhang, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY00441B

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